Belt drive system
AssigneeBando Chemical Industries, Ltd.
InventorsHiroyuki Sakanaka, Mitsuhiko Takahashi
Life of this patent
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Abstract
A belt drive system including an assembly of a heavy-duty drive V-belt 5 and pulleys 2 and 4 reduces noise generating owing to belt travel while ensuring the durability of the pulleys 2 and 4. The surfaces of belt grooves 6 in the V-pulleys 2 and 4 are micro-blasted or burnished so that their surface roughness satisfies the relational expression y≦−0.9×tp+100, where tp is the load length rate at a given position of a roughness curve indicating the surface features of the groove surfaces in the V-pulleys 2 and 4 and y is the variable (the degree of height) indicating by percentage the ratio of the height from the lowest valley having a maximum depth to the given position to a maximum height Ry.
Claims3
A belt drive system including:
- a drive V-belt having a large number of blocks engagingly fixed in mating relation to a pair of tension members;
- and a V-pulley formed with a groove for wrapping the V-belt therearound, the belt drive system being configured to transmit power by contact of side faces of the V-belt with the surface of the groove in the V-pulley, wherein
- the surface of the groove in the V-pulley is configured so that the following relational expression holds between tp and y of a roughness curve indicating the surface features of the surface of the groove in the V-pulley
- y≦−0.9×tp+100
- where tp is the load length rate, which is a function of both the heights and widths of microscopic hills on the surface of the groove of the V-pulley and is a percent rate of load applied per length to the surface of the groove of the V-pulley at a given position of the roughness curve in a direction of height and y is the degree of height indicated by a percentage of the ratio of the height from a lowest valley on the surface of the groove of the V-pulley having a maximum depth to the given position to a hill maximum height Ry, where tp is greater than 20% and less than 100%.
Dependencies are inferred from the claim text.